JULABO SC 2500w Eco-Series Recirculating Coolers - Manual (Page 40)

Electrical connections
40
11. Electrical connections
Notice:
Use shielded cables only.
The shield of the connecting cable is electrically connected to the plug housing.
The unit ensures safe operation if connecting cables with a maximum length of 3 m are
used. The use of longer cables does not affect proper performance of the unit, however
external interferences may have a negative impact on safe operation.
9 6
5 1
RS232C
RS232 serial interface
This port can be used to connect a computer with an RS232 cable for
remote control of the circulator.
Pin assignments RS232:
Pin 2 RxD Receive Data
Pin 3 TxD Transmit Data
Pin 5 0 V Signal GND
Pin 7 RTS Request to send
Pin 8 CTS Clear to send
Pin 1; 4; 6, 9 Reserved - do not use!
Accessories: Order
No. Description
8 980 073 RS232 interface cable 9-pol./9-pol. , 2,5 m
8 900 110 USB interface adapter cable
Control connector
Return flow safety device.
If the liquid levels in the recirculating cooler and the external system are
at different heights, overflowing must be prevented after the power has
been turned off. For this reason, solenoid valves for loop circuit can be
integrated in the loop circuit.

The control output is not powered in the OFF condition.
Output voltage: 230 V
 / max. 0.1 A